summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorLudovic Desroches <ludovic.desroches@atmel.com>2013-11-22 20:08:43 +0400
committerNicolas Ferre <nicolas.ferre@atmel.com>2013-12-02 17:14:42 +0400
commit58e7b1d5826ac6a64b1101d8a70162bc084a7d1e (patch)
tree133061595c50da263866003aca05cdccacc46576
parent6ce4eac1f600b34f2f7f58f9cd8f0503d79e42ae (diff)
downloadlinux-58e7b1d5826ac6a64b1101d8a70162bc084a7d1e.tar.xz
ARM: at91: sama5d3: reduce TWI internal clock frequency
With some devices, transfer hangs during I2C frame transmission. This issue disappears when reducing the internal frequency of the TWI IP. Even if it is indicated that internal clock max frequency is 66MHz, it seems we have oversampling on I2C signals making TWI believe that a transfer in progress is done. This fix has no impact on the I2C bus frequency. Cc: <stable@vger.kernel.org> #3.10+ Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
-rw-r--r--arch/arm/mach-at91/sama5d3.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mach-at91/sama5d3.c b/arch/arm/mach-at91/sama5d3.c
index 3ea86428ee09..a28873fe3049 100644
--- a/arch/arm/mach-at91/sama5d3.c
+++ b/arch/arm/mach-at91/sama5d3.c
@@ -95,19 +95,19 @@ static struct clk twi0_clk = {
.name = "twi0_clk",
.pid = SAMA5D3_ID_TWI0,
.type = CLK_TYPE_PERIPHERAL,
- .div = AT91_PMC_PCR_DIV2,
+ .div = AT91_PMC_PCR_DIV8,
};
static struct clk twi1_clk = {
.name = "twi1_clk",
.pid = SAMA5D3_ID_TWI1,
.type = CLK_TYPE_PERIPHERAL,
- .div = AT91_PMC_PCR_DIV2,
+ .div = AT91_PMC_PCR_DIV8,
};
static struct clk twi2_clk = {
.name = "twi2_clk",
.pid = SAMA5D3_ID_TWI2,
.type = CLK_TYPE_PERIPHERAL,
- .div = AT91_PMC_PCR_DIV2,
+ .div = AT91_PMC_PCR_DIV8,
};
static struct clk mmc0_clk = {
.name = "mci0_clk",